<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.trim.number="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <input type="hidden" v-model="ind" />
    <div>
      <button @click="btn">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
    <div>年龄总和:{{ sum }}</div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      list: [
        { name: "李雯雯", age: 68, sex: "女" },
        { name: "钟金禄", age: 88, sex: "女" },
      ],
      name: "",
      age: "",
      sex: "",
      ind: "",
    };
  },
  methods: {
    btn() {
      if (this.list[this.ind]) {
        const li = this.list[this.ind];
        return (
          (li.name = this.name),
          (li.age = this.age),
          (li.sex = this.sex),
          (this.ind = ""),
          (this.name = ""),
          (this.age = ""),
          (this.sex = "")
        );
      }

      if (!this.name || !this.age || !this.sex) {
        return alert("请填入数据");
      }
      this.list.push({ name: this.name, age: this.age, sex: this.sex });
      this.name = "";
      this.age = "";
      this.sex = "";
    },
    del(index) {
      this.list.splice(index, 1);
    },
    edit(index) {
      let Ele = this.list[index];
      this.name = Ele.name;
      this.age = Ele.age;
      this.sex = Ele.sex;
      this.ind = index;
    },
  },
  computed: {
    sum() {
      return this.list.reduce(function(sum, current) {
        return (sum += current.age);
      }, 0);
    },
  },
};
</script>
